Please use screws to secure the propellers. Longer screws included in the package are used to secure the propellers and the shorter ones are used to secure motors.
Please be cautious about screw thread length and frame thickness.
If you use too long screw thread length screws, the motor’s winding can be damaged and too short screw thread length may result in the motors loosening during flying.
The suitable screw thread length should be 1.5mm-2mm longer than the frame thickness. For example, 3mm thickness frame will be a good combo with 4.5mm-5mm screw thread length screws.

Stepped Shaft and Tall Stator Design Increases Durability
Crashes are unavoidable during flying. You may crash into trees, concrete roads or abandoned buildings, etc during flying. Durable gears could save you tons of time repairing drones. And that’s why this 1104 motor comes with a stepped shaft and tall stator design.
The stepped shaft design makes the motor more robust. And this 1104 motor features a tall stator design. The distance between the shaft and the mass of the motor is shorter making the bell smaller. And the bottom plate of the motor is designed to be thicker. All of these design is made to help the motor stand up to crashes well in long time use.









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